      1   1 Identifier foo
      1   5 Op_assign
      1   7 Integer 12 
      1   9 Semicolon
      2   1 Keyword_if
      2   4 LeftParen
      2   5 Identifier foo
      2   8 RightParen
      2  10 LeftBrace
      3   3 Identifier bar
      3   7 Op_assign
      3   9 Integer 65 
      3  11 Semicolon
      4   3 Keyword_putc
      4   8 LeftParen
      4   9 Identifier bar
      4  12 RightParen
      4  13 Semicolon
      5   1 RightBrace
      6   1 End_of_input
